Some starting points to finding statutes and regulations.
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GovInfo - Portal - Provides access federal government publications (cases, statutes, regulations). Govinfo is the new FDsys. Has public and private laws enacted from the 104th Congress (1995-1996) to the present. Beginning with the 110th Congress (2007-2008), the laws are digitally signed and certified. Authentic copies!
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U.S. Constitution Research Guide - Law Library of Congress guide to the U.S. Constitution, with the text and additional resources.
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United States Legislative - Law Library of Congress guide to the legislative process and Congress, includes overview, procedural manuals, Congressional Record, and other Congressional reports and publications.
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United States Code - Has historic access to U.S. Code editions back to 1994.